I have a table with two columns: A 1 A 1 A 2 B 2 C 0
I would like to produce a third column that contains the counts of each unique combination of col1 and col2: A 1 2 A 1 2 A 2 1 B 2 1 C 0 1 How can I do this in R? Thanks in advance ... -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
